Growth of Europous Oxide (EuO) Single Crystals

Abstract

The desirability of having large sound single crystals of EuO for a number of physical measurements has been well established. Although crystals of EuO had previously been grown, they were either of poor quality, primarily because of container contamination, or too small for many measurements. We report here on a method of growing large, single-phase, mechanically sound crystals of EuO. The method is one where growth takes place from a solution containing an excess of europium metal. The solution, sealed in molybdenum crucibles, is cooled from 1950°–2000°C at the rate of about 25°/h. Centimeter-size crystals were grown and shown to be of extremely good quality by an examination of their Laue spots and their microstructure. The crystals have a lattice constant of 5.1451 ű0.0003 and a density of 8.180±0.002. The data from the crystal-growing experiments were used to propose a phase diagram in which EuO, when pure, is shown to be an incongruently melting compound.

Investigations at high temperatures: Condensed-phase equilibria and vaporization studies with a mass spectrometer

“…There was no visible excesa europium metal in this sample, but the surfaces of uncleaved crystals tarnished in air over a period of several months, probably becuase of the presence of europium metal in the grain boundaries. 25 These results are consistent with those of Guerci and Shafer. However, I believe that as yet there is not enough evidence to conclude that EuO melts peritectically, as they suggest, rather than congruently.…”

Hetero-epitaxial EuO interfaces studied by analytic electron microscopy

“…19 Achieving conditions within such a narrow growth window is an immense challenge common to the epitaxial integration of all oxides with silicon. 20,21 Moreover, the +5.6% lattice mismatch 22 between EuO and Si could lead to misfit dislocations or other disorder.…”

Magnetic properties and instability phenomena in doped Euo

“…The model relies on some approximations [10] [11]; this has been described elsewhere [12]. A [16] (referred (M) [10].…”